Transmitting-Receiving Circuit for Overlapping Transmitting and Receiving Channels

Abstract

The invention relates to an improved transmitting-receiving circuit for overlapping transmitting and receiving channels comprising two 3-gate circuits ( 15 a , 15 b ), wherein two transmitting paths ( 11 a , 11 b ) are associated to a transmitting input ( 1 ), two receiving paths, ( 25 a , 25 b ) are associated to a receiving output ( 3 ) and two antenna paths ( 21 a , 21 b ) are associated to an antenna connector ( 5 ), each part leading to said two 3-gate circuits ( 15 a , 15 b ). A phase shift, preferably of 90°, is carried out in one path, respectively, whereas no shift phase is carried out in the corresponding parallel path, thereby making it possible to produce a broadband suppression on the receiving output for all signal components jumping from the transmitting input ( 1 ) over to the receiving output ( 3 ).

1 - 9 . (canceled) 
   
   
       10 . A transmitting-receiving circuit for overlapping, receiving and transmitting channels, comprising the following features:
 with a transmitting input,   with a receiving output,   with an antenna connector,   with a 3-gate circuit,   the transmitting input being connected to a first gate of the 3-gate circuit and a next gate of this 3-gate circuit connected to an antenna and the third gate of the 3-gate circuit connected to the receiving output,   two parallel split transmitting paths are arranged downstream to the transmitting input,   a second 3-gate circuit is provided, in which the respective first gate of the two 3-gate circuits in each case is connected to one transmitting path of the two transmitting paths,   two parallel antenna paths lead from the two subsequent gates of the two 3-gate circuits to the one antenna or to two antennas,   parallel receiving paths proceed from the two 3-gate circuits in each case from a third gate to the receiving output,   a device is provided in only one of the transmitting paths, in only one of the antenna paths and in only one of the receiving paths in each case for carrying out a first phase shift of 900+n×180°, in which a second phase shift of n×180° is provided in the respective other transmitting path, in the other antenna path and in the other receiving path,   the first phase shift of 90°+n×180° is provided in the transmitting path and in the receiving path, which are connected via the same 3-gate circuit,   the phase shift of 90°+n×180° is provided in that antenna path, which is connected via the 3-gate circuit to that transmitting path and to that subsequent receiving path in which a phase shift of n×180° is provided, and   in which n is a natural whole number including “0”, characterized by the following further features:   the 3-gate circuits are constructed in the form of circulators,   devices, integrated in the power dividing circuit and/or in the compound circuit and/or in the compound circuit and/or in the combiner circuit, are provided for carrying out a phase shift, and   the power dividing circuit, the combiner circuit and/or the compound circuit is/are formed as 90° hybrid integrated circuits, as a result of which a 90° phase shift is carried out in the one transmission branch, the one antenna branch and the one receiving branch respectively.   
   
   
       11 . The transmitting-receiving circuit as claimed in  claim 10 , wherein two antennas are provided, in which the one antenna [sic] is connected to the one antenna path and the second antenna to the second antenna path. 
   
   
       12 . The transmitting-receiving circuit as claimed in  claim 10 , wherein an antenna is provided, and wherein the two antenna paths are connected via a combiner circuit to this antenna. 
   
   
       13 . The transmitting-receiving circuit as claimed  claim 10 , wherein a power dividing circuit is provided on the transmitting input, via which a sent transmission signal can be split into two signals with equal power rating or approximately equal power rating. 
   
   
       14 . The transmitting-receiving circuit as claimed in  claim 10 , wherein a compound circuit is provided on the receiving output, via which the signals sent to the two receiving paths can be combined. 
   
   
       15 . The transmitting-receiving circuit as claimed in  claim 10 , wherein the power dividing circuit, the combiner circuit and/or the compound circuit are formed so that the signal power or signal intensity in the respective two transmitting paths and/or the two antenna paths and/or the two receiving paths differ by less than 50%, in particular less than 40%, 30%, 20% and preferably less than 10%.